Article (Scientific journals)
Reassessing the importance of the colour-singlet contributions to direct $J/ + W$ production at the LHC and the Tevatron
Lansberg, Jean-Philippe; Lorce, Cédric
2013In Physics Letters B, B726, p. 218-222
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Abstract :
[en] We show that the colour-singlet contributions to the hadroproduction of $J/\Psi$ in association with a W boson are sizable, if not dominant over the colour-octet contributions. They are of two kinds, $sg\toJ/\Psi+c+W$ at $\alpha^3s\alpja$ and $q\overline q' \to\gamma^\star /Z ^\star W\to J/\Psi W$ at order $\alpha^3$. These have not been considered in the literature until now. Our conclusion is that the hadroproduction of a $J/\Psi$ in association with a W boson cannot be claimed as a clean probe of the colour-octet mechanism. The rate are small even at the LHC and it will be very delicate to disentangle the colour-octet contributions from the sizable colour-singlet ones and from the possibly large double-parton-scattering contributions. During this analysis, we have also noted that, for reactions such as the production of a $J/\Psi$ by light quark–antiquark fusion, the colour-singlet contribution via an off-shell photon is of the order of the expectation from the colour-octet contribution via an off-shell gluon. This is relevant for inclusive production at low energies close to the threshold. Such an observation also likely extends to other processes naturally involving light-quark annihilation.
Disciplines :
Physics
Author, co-author :
Lansberg, Jean-Philippe ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules
Lorce, Cédric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules
Language :
English
Title :
Reassessing the importance of the colour-singlet contributions to direct $J/ + W$ production at the LHC and the Tevatron
Publication date :
2013
Journal title :
Physics Letters B
ISSN :
0370-2693
eISSN :
1873-2445
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
B726
Pages :
218-222
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 November 2013

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